NERC RC Exam Questions With Correct
Answers
What is ACE? - answer(NIa - NIs) - 10β(fa - fs) - Ime
Calculated every 6 seconds
Uses Tie line Frequency Bias
What is Tie line deviation? - answerLargest offset to ACE
What is NIA? - answerNet Interchange Actual (sum of all tie-line values)
What i...
What is ACE? - answer✔✔(NIa - NIs) - 10β(fa - fs) - Ime
Calculated every 6 seconds
Uses Tie line Frequency Bias
What is Tie line deviation? - answer✔✔Largest offset to ACE
What is NIA? - answer✔✔Net Interchange Actual (sum of all tie-line values)
What is NIS? - answer✔✔Net Interchange Scheduled (sum of all interchange schedules)
What is the multiplier for frequency bias? - answer✔✔10
What is β? - answer✔✔Frequency bias - represented as negative number in ACE calculation -
reflects area natural response to frequency changes (Inertia, Governor, Load) - atleast 1% of
annual peak load for areas with native load - 1% of peak generation output for area with no load
What is FA? - answer✔✔Frequency Actual
What is FS? - answer✔✔Frequency Schedule - normally 60.00 HZ except for time corrections -
+/- .02 Hz
What is IME? - answer✔✔Meter error
fudge factor
used for inadvertent bilateral payback
Negligible
What should be done if unable to calculate ACE for 30 minutes? - answer✔✔Contact RC
How often should time error and frequency devices be checked/calibrated? - answer✔✔Annually
What happens during External Loss of Load? - answer✔✔Frequency increases, no change in
ACE.
What is the Frequency Bias Setting? - answer✔✔Monthly average >= 1% of estimated yearly
peak demand per 0.1 Hz
When should the Balancing Authority recalculate its Frequency Bias Setting? - answer✔✔By
January 1 of each year
What happens when there is internal generation loss? - answer✔✔Frequency and ACE drop, tie-
line flows increase into the system
What happens when there is external generation loss? - answer✔✔Frequency drops, no change
in ACE, net tie-line flows increase out of the system
What happens when Frequency bias setting is lower than frequency response? - answer✔✔ACE
will be positive causing the AGC to lower generation
What is the percentage change in load required for a 1% change in frequency? - answer✔✔1% -
2% change in load
What is the load reduction when Transmission Customer Voltage is reduced by 5%? -
answer✔✔Load will reduce by 3%
What happens to ACE and AGC when the frequency bias setting is set to a less negative value
than the frequency response of a Balancing Authority and a frequency increase is caused by a
sudden loss of load in an external balancing area? - answer✔✔ACE will be a negative value and
AGC will increase generation
What happens to ACE and AGC when the frequency bias setting is less negative than the
frequency response of a Balancing Authority and a frequency decline is caused by a sudden loss
of generation in an external balancing area? - answer✔✔ACE will be a positive value and AGC
will lower generation
What is the normal schedule frequency? - answer✔✔60.00 Hz
What is the frequency correction for fast clock schedule? - answer✔✔59.98 Hz
What is the frequency corrections for a slow clock schedule? - answer✔✔60.02 Hz
When does frequency increase? - answer✔✔Generation increases or load decreases
When does frequency decrease? - answer✔✔Generation decreases or load increases
Who is the Time Monitor? - answer✔✔Can only be RC
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